Uniform Field Emission from Carbon Nanotubes Fabricated by CO Disproportionation.

ChemInform ◽  
2004 ◽  
Vol 35 (13) ◽  
Author(s):  
Jin Seung Lee ◽  
Jung Sang Suh
Keyword(s):  
Carbon Nanotubes ◽  
Field Emission ◽  
Uniform Field ◽  
Co Disproportionation

Deposition and Characterization of IrO2 Nanocrystals on Vertically Aligned Carbon Nanotubes by MOCVD

2011 ◽  
Vol 170 ◽  
pp. 70-73
Author(s):  
Yi Min Chen ◽  
Ying Sheng Huang ◽  
Kuei Yi Lee ◽  
Kwong Kau Tiong
Keyword(s):  
Carbon Nanotubes ◽  
Electron Microscope ◽  
Surface Morphology ◽  
Field Emission ◽  
Organic Chemical ◽  
Uniform Field ◽  
Uniform Size ◽  
Vertically Aligned Carbon Nanotubes ◽  
Aligned Carbon Nanotubes ◽  
Vertically Aligned

IrO2 nanocrystals (NCs) were grown on vertically aligned carbon nanotubes (CNTs) forming IrO2/CNTs nanocomposites by metal organic chemical vapor deposition using (C6H7)(C8H12)Ir as a source reagent. The surface morphology, structural and spectroscopic properties of the nanocomposites were characterized. Micrographs of field-emission scanning electron microscope showed that the surface morphology of the as-deposited IrO2 NCs varied from particle-like to tube-like NCs as the deposition time increased from 5 to 60 min. The transmission electron microscope image of IrO2/CNTs nanocomposites revealed that IrO2 NCs had been deposited onto the surface of the CNTs with uniform size distribution and random directions. X-ray diffraction pattern confirmed the formation of pure rutile IrO2 NCs on CNTs. The redshifts of the peak positions and broadening of linewidths of the IrO2 Raman features were attributed mainly to the size effect. The particles-like IrO2 NCs may be used as a protective layer on CNTs, providing stable and uniform field emission application. While the nanotube-like structure may increase the surface-to-volume ratio which makes the IrO2/CNTs nanocomposites as an attractive candidate for the supercapacitor application.

FABRICATION OF ELECTRON FIELD EMITTERS USING CARBON NANOTUBES

2000 ◽  
Vol 10 (01) ◽  
pp. 5-11
Author(s):  
YOUNG CHUL CHOI ◽  
YOUNG SOO PARK ◽  
YOUNG HEE LEE ◽  
WON BONG CHOI ◽  
NAE SUNG LEE ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Field Emission ◽  
Field Enhancement ◽  
Chemical Vapor ◽  
Large Field ◽  
Single Wall Carbon Nanotubes ◽  
Uniform Field ◽  
Large Area ◽  
Entire Area ◽  
Glass Substrates

Carbon nanotube (CNT)-based field emission displays (FEDs) have been fabricated using well-aligned nanotubes on substrates in situ grown by thermal chemical vapor deposition (CVD), and paste squeeze and surface rubbing techniques. Although the former seems to be an ultimate approach for CNT-based FED, a large area synthesis and uniform field emission over the entire area is not yet easily accessible. On the other hand, the latter is fully scalable on glass substrates and shows very high luminance of 1800 cd/m2 at 4 V/μm. The degradation of emission currents for single-wall carbon nanotubes was less than 10% in electrical aging tests. Large field-enhancement factors (23,000–46,000) and low turn-on voltages (1.5-3 V/μm) were attributed to well-aligned carbon nanotubes on substrates and a large number density of carbon nanotubes of 5-10 μm-2, which was confirmed by high-resolution scanning electron microscopy.

Effect of adsorbates on field emission from flame-synthesized carbon nanotubes

2008 ◽  
Vol 41 (19) ◽  
pp. 195401 ◽  
Author(s):  
Chun Li ◽  
Guojia Fang ◽  
Xiaoxia Yang ◽  
Nishuang Liu ◽  
Yuping Liu ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Field Emission
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